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<blockquote data-quote="cartraveller" data-source="post: 8710961" data-attributes="member: 680513">Okay, thanks! Ditching the head unit is not an option for several reasons. I see two possible ways for going forward:1) combine the inputs and let the amplifier do the filteringThe amplifier has 4 inputs and 4 outputs. I&#039;m able to decide the mapping. Currently input 1/2 are mapped on output 1/2 and input 3/4 are mapped on output 3/4. Would it be better if I would combine input 1 and 3 and fix both on input 1. And the same for input 2 and 4 and attach both to input 2. This way the input signal is combined and looks &#039;reasonably okay&#039;. I can map the input signal on output 1/2 and 3/4. I will use 1/2 for the lows (with a low pass filter) and 3/4 for the mid/highs (with a high pass filter), so I can decide on the filtering myself. I would like to get more lows out of the mids (up until approx. 150 Hz) and use the lows purely for the lows (&gt;150 Hz). Would that be possible and would that help to improve the sound? I&#039;m not sure whether it is &#039;technically&#039; possible to combine two outputs channels from the head unit on one input of the amplifier.2) Use the filtering from the head unitDon&#039;t change anything in the wiring, and don&#039;t set any filtering in the amplifier and basically&nbsp; accept the current filtering that is coming from the head unit. I can still correct the frequency curve with the DSP functionality from the amplifier, but there will be a huge overlap in frequencies that come out of the lows and out of the mids as you can see in the graphs that I posted.Not sure whether I managed explain my self (sorry for my English...). What would be your advice? Option 1 or option 2?</blockquote>

[QUOTE="cartraveller, post: 8710961, member: 680513"] Okay, thanks! Ditching the head unit is not an option for several reasons. I see two possible ways for going forward: 1) combine the inputs and let the amplifier do the filtering The amplifier has 4 inputs and 4 outputs. I'm able to decide the mapping. Currently input 1/2 are mapped on output 1/2 and input 3/4 are mapped on output 3/4. Would it be better if I would combine input 1 and 3 and fix both on input 1. And the same for input 2 and 4 and attach both to input 2. This way the input signal is combined and looks 'reasonably okay'. I can map the input signal on output 1/2 and 3/4. I will use 1/2 for the lows (with a low pass filter) and 3/4 for the mid/highs (with a high pass filter), so I can decide on the filtering myself. I would like to get more lows out of the mids (up until approx. 150 Hz) and use the lows purely for the lows (>150 Hz). Would that be possible and would that help to improve the sound? I'm not sure whether it is 'technically' possible to combine two outputs channels from the head unit on one input of the amplifier. 2) Use the filtering from the head unit Don't change anything in the wiring, and don't set any filtering in the amplifier and basically accept the current filtering that is coming from the head unit. I can still correct the frequency curve with the DSP functionality from the amplifier, but there will be a huge overlap in frequencies that come out of the lows and out of the mids as you can see in the graphs that I posted. Not sure whether I managed explain my self (sorry for my English...). What would be your advice? Option 1 or option 2? [/QUOTE]

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